Question

Сопротивление электрического паяльника 440 Ом. Напряжение, при котором он работает, 220 В. Чему равно количество теплоты, выделяемое паяльником за 2 минуты?

Answer 1

Q=I^2RT ( ток в квадрате, умножить на сопротивление, и на время). Находим ток по формуле I=U/R =0.5 A и подставляем в формулу для количества теплоты Q=13.2 кДж

Answer 2

Calculation of Heat Generated by the Soldering Iron

To calculate the amount of heat generated by the soldering iron, we can use the formula:

Q = I^2 * R * t

Where: - Q is the amount of heat generated (in joules) - I is the current flowing through the soldering iron (in amperes) - R is the resistance of the soldering iron (in ohms) - t is the time for which the soldering iron is used (in seconds)

Given: - Resistance of the soldering iron (R) = 440 Ω - Voltage at which it operates = 220 V - Time for which it is used (t) = 2 minutes = 120 seconds

To find the current (I), we can use Ohm's Law:

I = V / R

Where: - V is the voltage across the soldering iron

Substituting the given values, we can calculate the current:

I = 220 V / 440 Ω = 0.5 A

Now, we can substitute the values of I, R, and t into the formula to calculate the amount of heat generated (Q):

Q = (0.5 A)^2 * 440 Ω * 120 s

Calculating this expression will give us the amount of heat generated by the soldering iron in joules.

Please note that the search results did not provide specific information about the specific heat capacity of the soldering iron or any other relevant factors. Therefore, the calculation provided above assumes ideal conditions and does not take into account any losses or other factors that may affect the actual heat generated.